How do I extract a file from my os?

I am wanting to try out the 10.3 but I want to save my progress in my apk files from games and kakaotalk. Is there a way to save the files and back it up to your computer to reload them? I tried a quick search but yielded no results.

game data files are more than likely saved on your device memory. If you can find it, you can try and save it to your PC and when you reload the game, copy that info back in the correct folder. not sure it would work tho definitively.